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  • A set is a well-defined collection of objects.
  • Sets are usually represented by capital letters A, B, C, D, X, Y, Z, etc. The objects inside a set are called elements or members of a set. They are denoted by small letters a, b, c, d, x, y, z, etc.
  • If a is an element of a set A, then we say that “a belongs to A” and mathematically we write it as “aA”; if b is not an elem…

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